proposals with champions who are missing from delegates.txt

[michaelficarra]

The proposals below list a champion who is not present in delegates.txt. Champions are required to be delegates, so each of these should be resolved by either adding the missing entry in delegates.txt or removing them as a champion of their proposal.

proposal	stage	problematic champion	full champion list
Signals	1	Rob Eisenberg	Daniel Ehrenberg (DE), Yehuda Katz (YK), Jatin Ramanathan (JRA), Shay Lewis (SYL), Kristen Hewell Garrett (KHG), Dominic Gannaway (DGY), Preston Sego (NVP), Milo Mighdoll (MLM), Rob Eisenberg
Function bind syntax	0	Matthew Podwysocki	Brian Terlson (BT), Matthew Podwysocki
Reflect.{isCallable,isConstructor}	0	Caitlin Potter	Caitlin Potter
Object.getOwnPropertyDescriptors	4	Andrea Giammarchi	Jordan Harband (JHD), Andrea Giammarchi
{Set,Map}.prototype.toJSON	rejected	David Bruant	David Bruant, Jordan Harband (JHD)
eraDisplay option for Intl.DateTimeFormat	2	Louis-Aime	Shane Carr (SFC), Louis-Aime

[ljharb]

I've taken care of 2 of the 6 rows here.